Some evidence for acupuncture. Pretty weak though.
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"Belief effects" cannot be uncoupled from the clinical trial process. I'm a huge skeptic, but there are plenty of treatments and practices that we do not have a physiological explanation for (yet yield an outcome for a patient).
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I think that is an assumption; neuroimaging shows it’s more than a statistical artifact.https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1002570 …
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fMRI studies? Not particularly impressive. In placebo studies, fMRI results are massively oversold, frequently underpowered, and often poorly reproducibly; for example... https://sciencebasedmedicine.org/debunking-the-magical-power-of-the-placebo-effect-for-chronic-pain-yet-again/ …
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